/* ============================================================
   CXT Hub 官网共享样式
   设计令牌与产品展示页（V7）同源：深色科技风 + 品牌青
   主题：:root[data-theme="dark"]（默认） / :root[data-theme="light"]
  注意：变量选择器必须限定在 :root 上，否则带 data-theme 属性的
        主题切换按钮会被反向主题变量覆盖，导致文字与背景同色。
   ============================================================ */

/* ===== 设计令牌 ===== */
:root,:root[data-theme="dark"]{
  --bg:#080b12;
  --panel:#0f1520;
  --panel-2:#131b29;
  --input:#1a2436;
  --border:rgba(255,255,255,.1);
  --border-strong:rgba(255,255,255,.18);
  --text-1:#eef4fb;
  --text-2:rgba(238,244,251,.72);
  --text-3:rgba(238,244,251,.45);
  --brand:#2dd4bf;
  --brand-2:#38bdf8;
  --brand-3:#a78bfa;
  --brand-soft:rgba(45,212,191,.12);
  --warn:#fbbf24;
  --warn-soft:rgba(251,191,36,.08);
  --warn-border:rgba(251,191,36,.42);
  --warn-soft-strong:rgba(251,191,36,.18);
  --nav-bg:rgba(8,11,18,.9);
  --btn-text:#052e29;
  --kb-shell:#4b5b73;
  --acc-border:rgba(45,212,191,.5);
  --shadow:0 8px 28px rgba(0,0,0,.35);
  --radius-m:10px; --radius-l:16px;
  --font:'Inter','HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --mono:'Fira Code','Consolas',monospace;
}
:root[data-theme="light"]{
  --bg:#f4f6fa;
  --panel:#ffffff;
  --panel-2:#f7f9fc;
  --input:#eef1f6;
  --border:rgba(15,23,42,.1);
  --border-strong:rgba(15,23,42,.18);
  --text-1:#0f172a;
  --text-2:rgba(15,23,42,.72);
  --text-3:rgba(15,23,42,.5);
  --brand:#0d9488;
  --brand-2:#0284c7;
  --brand-3:#7c3aed;
  --brand-soft:rgba(13,148,136,.1);
  --warn:#b45309;
  --warn-soft:rgba(180,83,9,.06);
  --warn-border:rgba(180,83,9,.35);
  --warn-soft-strong:rgba(180,83,9,.13);
  --nav-bg:rgba(255,255,255,.92);
  --btn-text:#ffffff;
  --kb-shell:#c6cfdb;
  --acc-border:rgba(13,148,136,.45);
  --shadow:0 8px 28px rgba(15,23,42,.08);
}

/* ===== 基础 ===== */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text-1);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
img,svg{max-width:100%}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
section{padding:64px 0}
h2{font-size:32px;letter-spacing:.5px;margin-bottom:10px}
.sub{color:var(--text-2);max-width:760px;margin-bottom:36px;font-size:15.5px}
.eyebrow{font-size:12.5px;font-weight:700;letter-spacing:2.5px;color:var(--brand);margin-bottom:8px}
svg.ic{width:20px;height:20px;display:block;flex:none}

/* ===== 顶部导航 ===== */
.nav{position:sticky;top:0;z-index:50;background:var(--nav-bg);border-bottom:1px solid var(--border);backdrop-filter:blur(6px)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:58px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;letter-spacing:.5px;white-space:nowrap;color:var(--text-1)}
.logo-badge{width:28px;height:28px;border-radius:8px;background:var(--brand);display:flex;align-items:center;justify-content:center;color:var(--btn-text);font-size:15px;font-weight:900}
.nav-right{display:flex;align-items:center;gap:22px}
.nav-links{display:flex;gap:24px;font-size:14px}
.nav-link{color:var(--text-2);transition:color .15s}
.nav-link:hover{color:var(--brand)}
/* 当前页高亮（页面 body 的 data-page 与链接 data-nav 对应） */
body[data-page="home"] .nav-link[data-nav="home"],
body[data-page="download"] .nav-link[data-nav="download"],
body[data-page="firmware"] .nav-link[data-nav="firmware"],
body[data-page="tutorial"] .nav-link[data-nav="tutorial"],
body[data-page="changelog"] .nav-link[data-nav="changelog"]{color:var(--brand);font-weight:700}
@media(max-width:760px){
  .nav-in{height:auto;flex-wrap:wrap;padding:9px 0 11px;gap:8px}
  .nav-links{order:3;width:100%;justify-content:space-between;gap:8px;font-size:12.5px;overflow-x:auto}
  .nav-link{white-space:nowrap}
}

/* 主题切换 */
.theme-switch{display:flex;gap:2px;background:var(--input);border:1px solid var(--border);border-radius:999px;padding:2px}
.theme-btn{border:none;background:transparent;color:var(--text-2);font-size:12px;padding:4px 12px;border-radius:999px;cursor:pointer;font-family:inherit;transition:all .15s}
.theme-btn.on{background:var(--brand);color:var(--btn-text);font-weight:700}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 26px;border-radius:var(--radius-m);font-size:15px;font-weight:700;border:1px solid transparent;cursor:pointer;font-family:inherit}
.btn-primary{background:var(--brand);color:var(--btn-text)}
.btn-primary:hover{filter:brightness(1.06)}
.btn-ghost{border-color:var(--border-strong);color:var(--text-1);background:transparent}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-old{border-color:var(--warn-border);color:var(--warn);background:var(--warn-soft);font-weight:800}
.btn-old:hover{background:var(--warn-soft-strong);border-color:var(--warn)}

/* ===== Hero ===== */
.hero{padding:76px 0 56px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}
@media(max-width:960px){.hero-grid{grid-template-columns:1fr}}
.hero h1{font-size:46px;line-height:1.22;letter-spacing:.5px}
.hero h1 .hl{color:var(--brand)}
.hero p.lead{color:var(--text-2);margin-top:18px;font-size:16.5px;max-width:560px}
.hero .chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.chip{display:inline-flex;align-items:center;gap:7px;padding:7px 14px;border:1px solid var(--border-strong);border-radius:999px;font-size:13px;color:var(--text-2);background:var(--panel)}
.chip b{color:var(--text-1)}
.cta-row{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
/* Hero 右侧：应用界面示意（通用样式，不针对具体键盘型号） */
.app-art{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:18px;position:relative}
.app-win{background:var(--panel-2);border:1px solid var(--border-strong);border-radius:12px;overflow:hidden}
.app-bar{display:flex;align-items:center;gap:6px;padding:10px 12px;border-bottom:1px solid var(--border);background:var(--input)}
.app-bar .dot{width:9px;height:9px;border-radius:50%}
.app-bar .dot.r{background:#f87171}
.app-bar .dot.y{background:#fbbf24}
.app-bar .dot.g{background:#4ade80}
.app-title{margin-left:8px;font-size:12px;color:var(--text-3);letter-spacing:1px}
.app-body{display:flex;min-height:210px}
.app-side{width:112px;flex:none;border-right:1px solid var(--border);padding:12px 8px;display:flex;flex-direction:column;gap:4px}
.app-side span{font-size:12px;color:var(--text-2);padding:7px 10px;border-radius:7px}
.app-side span.on{background:var(--brand-soft);color:var(--brand);font-weight:700}
.app-main{flex:1;padding:14px}
.keygrid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}
.kk{height:26px;border-radius:5px;background:var(--input);border:1px solid var(--border)}
.kk.on{background:var(--brand-soft);border-color:var(--acc-border)}
.app-cap{margin-top:10px;font-size:11px;color:var(--text-3);text-align:center}
.app-foot{display:flex;align-items:center;gap:10px;margin-top:14px}
.app-ico{width:22px;height:22px;border-radius:6px}
.app-foot b{font-size:13px;color:var(--text-1)}
.app-foot span{font-size:12px;color:var(--text-3);margin-left:auto}

/* ===== 卡片网格 ===== */
.cards{display:grid;gap:16px}
.cards.c3{grid-template-columns:repeat(3,1fr)}
.cards.c2{grid-template-columns:repeat(2,1fr)}
@media(max-width:960px){.cards.c3,.cards.c2{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.cards.c3,.cards.c2{grid-template-columns:1fr}}
.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:24px 22px;transition:border-color .18s,transform .18s}
.card:hover{border-color:var(--border-strong);transform:translateY(-2px)}
.card-icon{width:42px;height:42px;border-radius:11px;background:var(--brand-soft);display:flex;align-items:center;justify-content:center;color:var(--brand);margin-bottom:14px}
.card-icon.v2{background:rgba(56,189,248,.12);color:var(--brand-2)}
.card-icon.v3{background:rgba(167,139,250,.12);color:var(--brand-3)}
.card-icon.v4{background:rgba(251,191,36,.12);color:var(--warn)}
.card h3{font-size:16px;margin-bottom:8px}
.card p{font-size:13.5px;color:var(--text-2)}

/* ===== 品牌图标（Font Awesome 品牌徽标，填充式） ===== */
.brand-logo{width:auto;height:22px;display:block;flex:none;fill:currentColor}
.brand-logo.sm{height:17px}

/* ===== 平台卡片 ===== */
.plat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:980px){.plat-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){.plat-grid{grid-template-columns:1fr}}
.plat{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:24px 24px}
.plat h4{font-size:17px;margin-bottom:8px;display:flex;align-items:center;gap:9px}
.plat p{font-size:14px;color:var(--text-2)}
.plat.hl{border-color:var(--acc-border);grid-column:1/-1}
.plat.hl h4{color:var(--brand)}
.plat-tags{display:flex;flex-wrap:wrap;gap:9px;margin-top:14px}
.plat-tags span{font-size:12.5px;color:var(--brand);border:1px solid var(--acc-border);border-radius:999px;padding:3px 13px}

/* ===== 下载 CTA 区块 ===== */
.cta-box{background:linear-gradient(135deg,var(--brand-soft),transparent 60%),var(--panel);border:1px solid var(--acc-border);border-radius:var(--radius-l);padding:44px 40px;display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap}
.cta-box h3{font-size:26px;margin-bottom:6px}
.cta-box p{color:var(--text-2);font-size:14.5px}

/* ===== 社群模块 ===== */
.social-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:26px}
@media(max-width:860px){.social-grid{grid-template-columns:1fr}}
.social-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:26px;display:flex;flex-direction:column;gap:14px;transition:border-color .18s}
.social-card:hover{border-color:var(--border-strong)}
.social-head{display:flex;align-items:center;gap:13px}
.social-ico{width:44px;height:44px;border-radius:12px;background:var(--brand-soft);color:var(--brand);display:flex;align-items:center;justify-content:center;flex:none}
.social-ico.v2{background:rgba(167,139,250,.12);color:var(--brand-3)}
.social-head h3{font-size:17px;margin-bottom:2px}
.social-head p{font-size:13px;color:var(--text-2)}
.social-list{list-style:none;display:grid;gap:8px}
.social-list li{position:relative;padding-left:20px;font-size:13.5px;color:var(--text-2)}
.social-list li::before{content:'';position:absolute;left:2px;top:9px;width:6px;height:6px;border-radius:2px;background:var(--brand)}
.group-list{display:grid;gap:10px;margin-top:auto}
.group-item{background:var(--input);border:1px solid var(--border);border-radius:10px;padding:11px 12px}
.g-info{display:flex;flex-direction:column;gap:2px}
.g-info b{font-size:13.5px;color:var(--text-1);line-height:1.4}
.g-id{font-family:var(--mono);font-size:12.5px;color:var(--text-2)}
.g-actions{display:flex;gap:8px;align-items:center;margin-top:5px;flex-wrap:wrap}
.group-item .copy-btn{font-size:11.5px;padding:3px 9px}
.g-join{font-size:12px;font-weight:700;color:var(--brand);white-space:nowrap}
.g-join:hover{text-decoration:underline}
/* 二维码：默认隐藏，悬停 / 点击才弹出 */
.qr-pop-wrap{position:relative;display:inline-flex}
.qr-trigger{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:700;color:var(--text-2);border:1px solid var(--border-strong);background:transparent;border-radius:999px;padding:4px 10px;cursor:pointer;font-family:inherit;transition:all .15s}
.qr-trigger:hover{color:var(--brand);border-color:var(--brand)}
.qr-trigger svg{width:13px;height:13px}
.qr-pop{position:absolute;bottom:calc(100% + 10px);right:0;width:190px;background:var(--panel);border:1px solid var(--border-strong);border-radius:12px;padding:8px;box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transform:translateY(6px);transition:opacity .15s,transform .15s,visibility .15s;z-index:30}
.qr-pop img{display:block;width:100%;height:auto;border-radius:8px}
.qr-pop-cap{display:block;text-align:center;font-size:11.5px;color:var(--text-2);margin-top:6px}
.qr-pop-wrap:hover .qr-pop,.qr-pop-wrap.open .qr-pop{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}
@media(max-width:520px){.qr-pop{left:0;right:auto;width:170px}}
.qr-row{display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.qr-box{width:116px;height:116px;flex:none;border-radius:10px;border:1px solid var(--border-strong);background:#fff;position:relative;overflow:hidden}
.qr-box::before{content:'';position:absolute;inset:9px;background-image:conic-gradient(#0f172a 25%,#fff 0 50%,#0f172a 0 75%,#fff 0);background-size:13px 13px}
.qr-box::after{content:'二维码占位';position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:11px;color:#0f172a;background:rgba(255,255,255,.86)}
.qr-cap{flex:1;min-width:190px;font-size:13px;color:var(--text-2);line-height:1.7}
.qr-cap b{display:block;font-size:14.5px;color:var(--text-1);margin-bottom:3px}
.platforms{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.platforms a{display:inline-flex;align-items:center;gap:5px;font-size:12.5px;padding:5px 11px;border:1px solid var(--border-strong);border-radius:999px;color:var(--text-2)}
.platforms a:hover{border-color:var(--brand);color:var(--brand)}

/* ===== 页脚 ===== */
footer{border-top:1px solid var(--border);padding:36px 0 46px;color:var(--text-3);font-size:13px}
.foot-in{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;align-items:center}
footer a{color:var(--brand)}

/* ============================================================
   下载页
   ============================================================ */
.page-head{padding:56px 0 8px}
.page-head h1{font-size:38px;letter-spacing:.5px}
.page-head p{color:var(--text-2);margin-top:10px;font-size:15.5px}
.version-bar{display:flex;flex-wrap:wrap;gap:10px 26px;align-items:center;margin-top:20px;color:var(--text-2);font-size:13.5px}
.version-bar b{color:var(--text-1)}
.dl-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:34px}
@media(max-width:820px){.dl-grid{grid-template-columns:1fr}}
.dl-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:30px 28px}
.dl-card .os{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:700;margin-bottom:6px}
.dl-card .os svg{color:var(--brand)}
.dl-card .desc{color:var(--text-2);font-size:13.5px;margin-bottom:20px}
.dl-btn{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:14px;border-radius:var(--radius-m);background:var(--brand);color:var(--btn-text);font-size:15px;font-weight:800;border:none;cursor:pointer}
.dl-btn:hover{filter:brightness(1.06)}
.dl-note{margin-top:12px;font-size:12.5px;color:var(--text-3)}
.arch-row{display:flex;gap:8px;margin-top:12px}
.arch{font-size:12px;color:var(--text-2);border:1px solid var(--border);border-radius:999px;padding:2px 10px}
.tips-list{display:grid;gap:10px;margin-top:16px}
.tips-list li{list-style:none;position:relative;padding-left:24px;font-size:14px;color:var(--text-2)}
.tips-list li::before{content:'';position:absolute;left:2px;top:9px;width:7px;height:7px;border-radius:2px;background:var(--brand)}
.meta-table{width:100%;border-collapse:collapse;font-size:14px}
.meta-table th,.meta-table td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--border)}
.meta-table th{color:var(--text-2);font-weight:600;background:var(--panel-2);font-size:13px}
.meta-table td{color:var(--text-2)}
.meta-table td b{color:var(--text-1)}

/* ===== 网盘下载平台卡 ===== */
.dl-platform{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:26px;display:grid;grid-template-columns:minmax(230px,1fr) minmax(280px,1.15fr);gap:26px;align-items:center;margin-top:16px;transition:border-color .18s}
.dl-platform:hover{border-color:var(--border-strong)}
@media(max-width:780px){.dl-platform{grid-template-columns:1fr;gap:18px;padding:22px}}
.dl-os{display:flex;align-items:flex-start;gap:14px}
.dl-os .os-ico{width:46px;height:46px;border-radius:12px;background:var(--brand-soft);display:flex;align-items:center;justify-content:center;color:var(--brand);flex:none}
.dl-os h3{font-size:19px;margin-bottom:3px}
.dl-os .os-sub{font-size:13px;color:var(--text-2)}
.dl-os .os-sub b{color:var(--text-1)}
.dl-actions{display:grid;gap:10px}
.btn-dl{display:flex;align-items:center;gap:13px;padding:13px 17px;border-radius:var(--radius-m);background:var(--brand);color:var(--btn-text);font-weight:800;font-size:14.5px;border:1px solid transparent;transition:filter .15s,border-color .15s,color .15s}
.btn-dl:hover{filter:brightness(1.07)}
.btn-dl .btn-main{display:flex;flex-direction:column;line-height:1.35;text-align:left}
.btn-dl .btn-main small{font-weight:600;font-size:11.5px;opacity:.82}
.btn-dl .ext{margin-left:auto;opacity:.85}
.btn-dl.sub{background:var(--input);color:var(--text-1);border-color:var(--border-strong)}
.btn-dl.sub:hover{border-color:var(--brand);color:var(--brand);filter:none}
.btn-dl.sub .btn-main small{opacity:.7}
.dl-caption{font-size:12.5px;color:var(--text-3);margin-top:10px;line-height:1.7}
.pan-note{display:flex;gap:12px;align-items:flex-start;background:var(--panel-2);border:1px solid var(--border);border-left:3px solid var(--brand-2);border-radius:0 10px 10px 0;padding:15px 18px;font-size:13.5px;color:var(--text-2);margin-top:24px}
.pan-note svg{color:var(--brand-2);flex:none;margin-top:2px}
.pan-note b{color:var(--text-1)}

/* ===== 安装帮助折叠面板 ===== */
#help{scroll-margin-top:80px}
#help-win,#help-mac{scroll-margin-top:80px}
.help-h3 .brand-logo{color:var(--brand)}

/* ===== 醒目的安装帮助横幅（下载前可见） ===== */
.help-banner{display:flex;gap:16px;align-items:center;flex-wrap:wrap;background:var(--warn-soft);border:1px solid var(--warn-border);border-radius:var(--radius-l);padding:18px 20px;margin-top:20px}
.help-banner .hb-ico{width:42px;height:42px;border-radius:11px;background:var(--warn-soft-strong);color:var(--warn);display:flex;align-items:center;justify-content:center;flex:none}
.help-banner .hb-text{flex:1;min-width:260px}
.help-banner b{display:block;font-size:15.5px;margin-bottom:3px;color:var(--text-1)}
.help-banner p{font-size:13px;color:var(--text-2);line-height:1.65}
.help-banner .hb-actions{display:flex;gap:8px;flex-wrap:wrap}
.btn-help{font-size:12.5px;font-weight:700;padding:8px 14px;border-radius:8px;border:1px solid var(--warn-border);color:var(--warn);background:transparent;white-space:nowrap}
.btn-help:hover{background:var(--warn-soft-strong)}
.help-h3{font-size:16px;margin:26px 0 10px;display:flex;align-items:center;gap:8px;color:var(--text-1)}
.help-item{background:var(--panel);border:1px solid var(--border);border-radius:12px;margin-bottom:10px;overflow:hidden}
.help-item[open]{border-color:var(--border-strong)}
.help-item summary{list-style:none;cursor:pointer;padding:15px 50px 15px 18px;font-size:14.5px;font-weight:700;position:relative;color:var(--text-1)}
.help-item summary::-webkit-details-marker{display:none}
.help-item summary:hover{color:var(--brand)}
.help-item summary::after{content:'+';position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:20px;font-weight:400;color:var(--brand);line-height:1}
.help-item[open] summary::after{content:'\2212'}
.help-body{padding:0 18px 18px;font-size:13.8px;color:var(--text-2)}
.help-body ol{margin:6px 0 0 18px}
.help-body li{margin-bottom:7px}
.help-body p{margin-top:10px}
.help-body code,.steps code{font-family:var(--mono);font-size:12.5px;background:var(--input);border:1px solid var(--border);border-radius:5px;padding:2px 7px;color:var(--text-1);word-break:break-all}
/* 终端命令块 + 一键复制 */
.cmd-box{display:flex;align-items:center;gap:10px;background:var(--input);border:1px solid var(--border);border-radius:8px;padding:9px 12px;margin:8px 0}
.cmd-box code{flex:1;background:none;border:none;padding:0;word-break:break-all}
.copy-btn{flex:none;font-size:12px;font-weight:700;padding:5px 12px;border-radius:6px;border:1px solid var(--border-strong);background:var(--panel);color:var(--text-1);cursor:pointer;font-family:inherit;white-space:nowrap;transition:all .15s}
.copy-btn:hover{border-color:var(--brand);color:var(--brand)}
.copy-btn.done{color:var(--brand);border-color:var(--acc-border);background:var(--brand-soft)}

/* ============================================================
   教程页
   ============================================================ */
.tut-layout{display:grid;grid-template-columns:240px 1fr;gap:44px;align-items:start}
@media(max-width:960px){.tut-layout{grid-template-columns:1fr}}
.toc{position:sticky;top:80px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:18px 16px}
.toc-title{font-size:12px;font-weight:700;letter-spacing:2px;color:var(--text-3);margin-bottom:10px}
.toc a{display:block;padding:7px 10px;border-radius:8px;color:var(--text-2);font-size:13.5px}
.toc a:hover{background:var(--brand-soft);color:var(--brand)}
@media(max-width:960px){.toc{position:static}}
.chapter{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:30px 30px;margin-bottom:18px;scroll-margin-top:84px}
.chapter h2{font-size:23px;margin-bottom:6px}
.chapter .intro{color:var(--text-2);font-size:14.5px;margin-bottom:18px}
.steps{list-style:none;counter-reset:step}
.steps li{position:relative;padding-left:38px;margin-bottom:12px;font-size:14.5px;color:var(--text-2)}
.steps li::before{counter-increment:step;content:counter(step);position:absolute;left:0;top:1px;width:24px;height:24px;border-radius:50%;background:var(--brand-soft);color:var(--brand);font-size:12.5px;font-weight:700;display:flex;align-items:center;justify-content:center}
.steps li b{color:var(--text-1)}
.tip{border-left:3px solid var(--brand);background:var(--brand-soft);border-radius:0 8px 8px 0;padding:12px 16px;font-size:13.5px;color:var(--text-2);margin-top:16px}
.shot{border:1.5px dashed var(--border-strong);border-radius:12px;padding:34px 16px;text-align:center;color:var(--text-3);font-size:13px;margin-top:18px}
.quick{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:26px}
@media(max-width:820px){.quick{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.quick{grid-template-columns:1fr}}
.quick .step-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:20px 18px;counter-increment:qstep}
.quick{counter-reset:qstep}
.quick .step-card::before{content:counter(qstep,decimal-leading-zero);display:block;font-family:var(--mono);font-size:20px;font-weight:800;color:var(--brand);margin-bottom:8px}
.quick .step-card h4{font-size:14.5px;margin-bottom:4px}
.quick .step-card p{font-size:12.5px;color:var(--text-2)}

/* ===== 教程首页：章节入口 ===== */
.tut-lead{padding:56px 0 6px}
.tut-lead h1{font-size:38px;letter-spacing:.5px}
.tut-lead p{color:var(--text-2);margin-top:10px;font-size:15.5px;max-width:760px}
.path-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:30px}
@media(max-width:900px){.path-grid{grid-template-columns:1fr}}
.path{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:24px 22px;display:flex;flex-direction:column}
.path h3{font-size:17px;margin:2px 0 4px}
.path .path-sub{font-size:13px;color:var(--text-2);margin-bottom:12px}
.path ul{list-style:none;display:grid;gap:4px;margin-bottom:16px}
.path li a{display:flex;align-items:center;gap:9px;font-size:14px;color:var(--text-2);padding:8px 10px;border-radius:8px}
.path li a:hover{background:var(--brand-soft);color:var(--brand)}
.path li a::before{content:'';width:5px;height:5px;border-radius:2px;background:var(--brand);flex:none}
.path .path-link{margin-top:auto;font-size:13.5px;font-weight:700}

/* ===== 教程分页：页内切换 ===== */
.tut-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-top:22px}
.tut-tabs a{font-size:13px;padding:7px 15px;border-radius:999px;border:1px solid var(--border-strong);color:var(--text-2)}
.tut-tabs a:hover{border-color:var(--brand);color:var(--brand)}
.tut-tabs a.on{background:var(--brand-soft);border-color:var(--acc-border);color:var(--brand);font-weight:700}
.chapter h3{font-size:15.5px;margin:22px 0 8px;color:var(--text-1)}
.chapter h3:first-of-type{margin-top:18px}
.chapter .shot img{display:block;width:100%;border-radius:8px}
.pager{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap}
.pager a{display:flex;flex-direction:column;gap:2px;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:14px 18px;flex:1;min-width:220px}
.pager a:hover{border-color:var(--acc-border)}
.pager span{font-size:11.5px;color:var(--text-3);letter-spacing:1px}
.pager b{font-size:14.5px;color:var(--text-1)}
.pager a.next{text-align:right;align-items:flex-end}

/* ============================================================
   更新日志页
   ============================================================ */
.log-item{display:grid;grid-template-columns:190px 1fr;gap:26px;padding:30px 0;border-bottom:1px solid var(--border)}
@media(max-width:760px){.log-item{grid-template-columns:1fr;gap:12px}}
.log-ver b{display:inline-block;font-size:19px;color:var(--text-1);margin-bottom:4px}
.log-latest{display:inline-block;font-size:11px;font-weight:800;color:var(--btn-text);background:var(--brand);border-radius:5px;padding:1px 7px;margin-left:8px;vertical-align:2px}
.log-nav{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:13px;color:var(--text-3);padding-bottom:18px;border-bottom:1px solid var(--border)}
.log-nav a{font-family:var(--mono);font-size:13px}
.log-item{scroll-margin-top:80px}
.log-ver span{display:block;font-size:13px;color:var(--text-3)}
.log-tag{display:inline-block;font-size:11.5px;font-weight:700;border-radius:5px;padding:1px 8px;margin-right:6px}
.log-tag.new{color:var(--brand);background:var(--brand-soft);border:1px solid var(--acc-border)}
.log-tag.opt{color:var(--brand-2);background:rgba(56,189,248,.1);border:1px solid rgba(56,189,248,.4)}
.log-tag.fix{color:var(--warn);background:rgba(251,191,36,.1);border:1px solid rgba(251,191,36,.4)}
.log-list{list-style:none}
.log-list li{position:relative;padding-left:20px;font-size:14px;color:var(--text-2);margin-bottom:9px}
.log-list li::before{content:'';position:absolute;left:2px;top:10px;width:6px;height:6px;border-radius:2px;background:var(--border-strong)}

/* ============================================================
   固件页
   ============================================================ */
.fw-list{display:grid;gap:12px;margin-top:16px}
.fw-item{display:grid;grid-template-columns:1.35fr 1fr auto;gap:20px;align-items:center;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);padding:20px 22px}
@media(max-width:820px){.fw-item{grid-template-columns:1fr;gap:14px}}
.fw-dev{display:flex;align-items:center;gap:13px}
.fw-ico{width:42px;height:42px;border-radius:11px;background:var(--brand-soft);color:var(--brand);display:flex;align-items:center;justify-content:center;flex:none}
.fw-dev h3{font-size:16px;margin-bottom:2px}
.fw-dev span{font-size:12.5px;color:var(--text-3)}
.fw-meta{display:flex;gap:8px 18px;flex-wrap:wrap;font-size:13px;color:var(--text-2)}
.fw-meta b{color:var(--text-1)}
.btn-fw{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px;border-radius:9px;background:var(--brand);color:var(--btn-text);font-size:13.5px;font-weight:800;white-space:nowrap}
.btn-fw:hover{filter:brightness(1.07)}
.fw-empty{background:var(--panel-2);border:1px dashed var(--border-strong);border-radius:var(--radius-l);padding:16px 20px;font-size:13px;color:var(--text-2);margin-top:12px}
.fw-note{font-size:12.5px;color:var(--text-3);margin-top:10px}

/* ===== 通用小节 ===== */
.mt-0{margin-top:0}
.mt-16{margin-top:16px}
.mt-24{margin-top:24px}
.mt-40{margin-top:40px}

/* ============================================================
   首页密度优化
   目标：压缩模块间距与卡片内边距，移动端减少无效留白
   （仅作用于首页，不影响下载页、教程页等内容页）
   ============================================================ */
body[data-page="home"] section{padding:40px 0}
body[data-page="home"] .eyebrow{margin-bottom:6px}
body[data-page="home"] h2{font-size:30px;margin-bottom:8px}
body[data-page="home"] .sub{margin-bottom:20px}
body[data-page="home"] .hero{padding:54px 0 38px}
body[data-page="home"] .hero h1{font-size:42px}
body[data-page="home"] .hero p.lead{margin-top:14px}
body[data-page="home"] .hero .chips{margin-top:18px}
body[data-page="home"] .hero .cta-row{margin-top:22px}
body[data-page="home"] .card{padding:20px 18px}
body[data-page="home"] .plat{padding:20px}
body[data-page="home"] .cta-box{padding:30px 32px}
body[data-page="home"] .cta-box h3{font-size:23px}
body[data-page="home"] .social-card{padding:22px}
body[data-page="home"] .social-grid{margin-top:18px}
body[data-page="home"] footer{padding:26px 0 32px}

@media(max-width:760px){
  body[data-page="home"] section{padding:30px 0}
  body[data-page="home"] .hero{padding:32px 0 24px}
  body[data-page="home"] .hero-grid{gap:28px}
  body[data-page="home"] .hero h1{font-size:30px;line-height:1.28}
  body[data-page="home"] .hero p.lead{font-size:14.5px;margin-top:12px}
  body[data-page="home"] .hero .chips{gap:8px;margin-top:14px}
  body[data-page="home"] .chip{font-size:12px;padding:5px 10px}
  body[data-page="home"] .hero .cta-row{gap:10px;margin-top:18px}
  body[data-page="home"] .btn{padding:11px 16px;font-size:14px;gap:7px}
  body[data-page="home"] h2{font-size:25px}
  body[data-page="home"] .sub{font-size:14.5px;margin-bottom:16px}
  body[data-page="home"] .cards{gap:12px}
  body[data-page="home"] .card{padding:16px 14px}
  body[data-page="home"] .card-icon{width:38px;height:38px;margin-bottom:10px}
  body[data-page="home"] .card h3{font-size:15px;margin-bottom:5px}
  body[data-page="home"] .card p{font-size:12.5px}
  body[data-page="home"] .plat-grid{gap:12px}
  body[data-page="home"] .plat{padding:18px}
  body[data-page="home"] .cta-box{padding:24px 20px;gap:18px}
  body[data-page="home"] .cta-box h3{font-size:20px}
  body[data-page="home"] .cta-box p{font-size:13.5px}
  body[data-page="home"] .social-grid{gap:12px;margin-top:16px}
  body[data-page="home"] .social-card{padding:20px}
  body[data-page="home"] footer{padding:22px 0 28px}
  /* Hero 应用示意：移动端压缩高度 */
  body[data-page="home"] .app-art{padding:12px}
  body[data-page="home"] .app-body{min-height:150px}
  body[data-page="home"] .app-side{width:94px;padding:8px 6px}
  body[data-page="home"] .app-side span{font-size:11px;padding:5px 8px}
  body[data-page="home"] .app-main{padding:10px}
  body[data-page="home"] .kk{height:20px}
  body[data-page="home"] .app-cap{font-size:10.5px;margin-top:8px}
  body[data-page="home"] .app-foot{margin-top:10px}
}

/* 移动端亮点卡保持两列，避免 6 张单列拉长页面 */
@media(max-width:600px){
  body[data-page="home"] .cards.c3{grid-template-columns:repeat(2,1fr)}
}